The CIGTF High Accuracy Post-Processing Reference System (CHAPS)

Britt Snodgrass and John Raquet

Abstract:	The 46th Guidance Test Squadron (46th GTS) has developed the CIGTF High Accuracy Post-processing Reference System (CHAPS). CHAPS is a multi-sensor navigation reference system used for flight test evaluation of the position, velocity, and attitude performance of Global Positioning System (GPS) receivers, inertial navigation systems (INS), and other navigation devices. During flight, the CHAPS data acquisition system records data from an INS, a GPS receiver, and ground based transponders. After applying differential GPS corrections, this data is processed post-flight in an extended Kalman filter to calculate the flight test reference trajectory. When fully developed, CHAPS is expected to have a position accuracy of 1.2 meters (3D RMS) and a velocity accuracy of 0.03 meters per second (3D RMS) in both jamming and non-jamming environments.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	755 - 763
Cite this article:	Snodgrass, Britt, Raquet, John, "The CIGTF High Accuracy Post-Processing Reference System (CHAPS)," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 755-763.
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